US4251854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light angle indicator of photographic flash
Assignee: West Electric Co Ltd
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Filing: 1979-09-06
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Granted: 1981-02-17
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Expires: 1999-09-06
Abstract
Abstract In a light angle indicator of photographic flash having a main part containing at least a flash lamp and a front lens part slidably coupled to said main part, the improvement is that the light angle indicator comprises a first indicator panel fixed to said main part and having obliquely disposed transparent regions or windows and a second indicator panel fixed to said front lens part and having obliquely disposed bright marked regions either of said windows or said bright marked regions having marks or numerals to indicate light coverage angles.
Inventors
- 👤 Yoshikazu Kaneko
- 👤 Takashi Suzuka
- 👤 Tadahide Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:56
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/05; G03B2215/00; G03B2215/05; G03B2215/0514; G03B2215/0517; G03B2215/0525; G03B2215/0528
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A light angle indicator of photographic flash having a main part containing at least a flash lamp and a front lens part which is slidably coupled to said main part so as to vary distance between said lamp part and a lens of said front lens part, the improvement is that the light angle indicator comprises a first indicator panel linked to said main part and having obliquely disposed regions and a second indicator panel linked to said slidable front lens part and having inverse-obliquely disposed regions, said first indicator panel and said second indicator panel being slidably and superposedly disposed with each other, thereby a region of said first indicator panel and a region of said second indicator panel which are superposed each other forming a mark which is differently noticeable from rest of regions, said mark changing responding with changes of relative position of said slidable front lens part with respect to said main part.
Claim 2
Dependent Claim
157 words
A light angle indicator of photographic flash having a main part containing at least a flash lamp and a front lens part which is slidably coupled to said main part so as to vary distance between said lamp part and a lens of said front lens part, the improvement is that the light angle indicator comprises a first indicator panel linked to said main part and having obliquely disposed regions and a second indicator panel linked to said slidable front lens part and having inverse-obliquely disposed regions, said first indicator panel and said second indicator panel being slidably and superposedly disposed with each other, thereby a region of said first indicator panel and a region of said second indicator panel which are superposed each other forming a mark which is differently noticeable from rest of regions, said mark changing responding with changes of relative position of said slidable front lens part with respect to said main part.
Claim 3
Dependent Claim
51 words
A light angle indicator in accordance with claim 1 wherein said oblique disposed regions of said first indicator panel are transparent windows having numerals or marks for the corresponding angles thereon and said oblique disposed regions of said second indicator panel are regions of bright color in dark colored background space.
Claim 4
Dependent Claim
43 words
A light angle indicator in accordance with claim 1 wherein said oblique disposed regions of said first indicator panel are transparent windows and said obliquely disposed regions of said second indicator panel are regions having numeral or marks for the corresponding angles thereon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |